/* ZeroOne Labs — zeroonelabs.app */

@font-face {
  font-family: "Sora";
  src: url("/assets/fonts/sora-latin.woff2") format("woff2");
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #12131a;
  --volt: #c6f23c;
  --paper: #f5f4ee;

  --bg: var(--ink);
  --bg-raised: #1a1c26;
  --line: rgba(245, 244, 238, 0.09);
  --line-strong: rgba(245, 244, 238, 0.18);
  --text: var(--paper);
  --muted: #a4a5b0;
  --mark: var(--volt);
  --accent-text: var(--volt);
  --glow: rgba(198, 242, 60, 0.16);
  --grid: rgba(245, 244, 238, 0.045);

  --radius: 22px;
  --max: 1160px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: var(--paper);
  --bg-raised: #ffffff;
  --line: rgba(18, 19, 26, 0.1);
  --line-strong: rgba(18, 19, 26, 0.2);
  --text: var(--ink);
  --muted: #565866;
  --mark: var(--ink);
  --accent-text: var(--ink);
  --glow: rgba(198, 242, 60, 0.55);
  --grid: rgba(18, 19, 26, 0.05);
  color-scheme: light;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Sora", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-weight: 350;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.5s var(--ease), color 0.5s var(--ease);
  overflow-x: hidden;
}

a { color: inherit; }
img, svg { display: block; }

::selection { background: var(--volt); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 3px;
  border-radius: 6px;
}
:root[data-theme="light"] :focus-visible { outline-color: var(--ink); }

.skip {
  position: absolute; left: 16px; top: -60px; z-index: 50;
  background: var(--volt); color: var(--ink); padding: 10px 16px; border-radius: 10px;
  font-weight: 600; text-decoration: none;
}
.skip:focus { top: 16px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background-color 0.5s var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand svg { width: 30px; height: 30px; fill: var(--mark); transition: transform 0.9s var(--ease), fill 0.5s; }
.brand:hover svg { transform: rotate(180deg); }
.brand-name { font-size: 19px; letter-spacing: -0.01em; white-space: nowrap; }
.brand-name b { font-weight: 600; }
.brand-name span { font-weight: 300; }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a { text-decoration: none; font-size: 15px; color: var(--muted); transition: color 0.2s; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); }

/* 0/1 theme switch */
.bit {
  display: inline-flex; align-items: center; gap: 8px;
  background: none; border: 0; padding: 4px; cursor: pointer; color: var(--muted);
  font: 500 13px/1 "Sora", sans-serif; letter-spacing: 0.04em;
}
.bit-track {
  position: relative; width: 46px; height: 26px; border-radius: 99px;
  border: 1.5px solid var(--line-strong); transition: border-color 0.3s;
}
.bit-knob {
  position: absolute; top: 3px; left: 3px; width: 17px; height: 17px; border-radius: 99px;
  background: var(--volt); transform: translateX(20px);
  transition: transform 0.45s var(--ease), background-color 0.3s;
}
:root[data-theme="light"] .bit-knob { transform: translateX(0); background: var(--ink); }
.bit:hover .bit-track { border-color: var(--text); }
.bit .on, .bit .off { transition: color 0.3s; }
:root:not([data-theme="light"]) .bit .on,
:root[data-theme="light"] .bit .off { color: var(--text); }

/* ---------- hero ---------- */
.hero { position: relative; isolation: isolate; padding: 72px 0 96px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(ellipse 70% 75% at 70% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 75% at 70% 40%, #000 30%, transparent 75%);
}
.hero .wrap {
  display: grid; grid-template-columns: 1.15fr 0.85fr; align-items: center; gap: 48px;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted);
  margin: 0 0 28px;
}
.eyebrow .dot {
  width: 8px; height: 8px; border-radius: 99px; background: var(--volt);
  box-shadow: 0 0 0 4px var(--glow);
  animation: pulse 2.4s ease-in-out infinite;
}
:root[data-theme="light"] .eyebrow .dot { background: var(--ink); box-shadow: 0 0 0 4px rgba(198,242,60,.8); }

h1 {
  font-size: clamp(46px, 7.4vw, 96px);
  line-height: 0.98; letter-spacing: -0.045em; font-weight: 600; margin: 0 0 28px;
}
h1 .light { font-weight: 250; }
h1 em {
  font-style: normal; color: var(--accent-text); position: relative; white-space: nowrap;
}
:root[data-theme="light"] h1 em {
  background: linear-gradient(transparent 62%, var(--volt) 62%, var(--volt) 92%, transparent 92%);
}

.lead { font-size: clamp(17px, 1.6vw, 20px); color: var(--muted); max-width: 36ch; margin: 0 0 40px; }

.actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 24px; border-radius: 99px; text-decoration: none;
  font-weight: 500; font-size: 16px; line-height: 1;
  transition: transform 0.25s var(--ease), background-color 0.25s, border-color 0.25s, color 0.25s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--volt); color: var(--ink); }
.btn-primary:hover { background: #d4ff52; }
.btn-ghost { border: 1.5px solid var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--text); }
.btn svg { width: 16px; height: 16px; }

/* the mark */
.mark-stage { position: relative; display: grid; place-items: center; aspect-ratio: 1; }
.mark-stage::before {
  content: ""; position: absolute; inset: 12%; z-index: -1; border-radius: 50%;
  background: radial-gradient(circle, var(--glow) 0%, transparent 68%);
  filter: blur(10px);
  animation: breathe 6s ease-in-out infinite;
}
.mark-btn {
  width: 100%; max-width: 420px; aspect-ratio: 1; padding: 0; border: 0; background: none;
  cursor: pointer; color: inherit; -webkit-tap-highlight-color: transparent;
}
.mark-btn svg { width: 100%; height: 100%; overflow: visible; }
.mark-spin { transform-origin: 128px 128px; transition: transform 1.1s var(--ease); }
.mark-btn.flipped .mark-spin { transform: rotate(180deg); }
.mark path { fill: var(--mark); transition: fill 0.5s var(--ease), opacity 0.4s; }

.hero .mark .p-top, .hero .mark .p-tr { animation: in-tr 1.1s var(--ease) 0.15s both; }
.hero .mark .p-bot, .hero .mark .p-bl { animation: in-bl 1.1s var(--ease) 0.15s both; }
.hero .mark .p-slash { transform-origin: 128px 128px; animation: in-slash 0.8s var(--ease) 0.85s both; }

.mark-hint {
  position: absolute; bottom: 2%; left: 50%; transform: translateX(-50%);
  font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted);
  white-space: nowrap; opacity: 0; transition: opacity 0.4s;
}
.mark-stage:hover .mark-hint, .mark-btn:focus-visible + .mark-hint { opacity: 1; }

/* ---------- sections ---------- */
section { padding: 104px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; margin-bottom: 48px; flex-wrap: wrap; }
.kicker { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px; }
h2 { font-size: clamp(32px, 4.4vw, 54px); line-height: 1.05; letter-spacing: -0.035em; font-weight: 600; margin: 0; }
h2 .light { font-weight: 250; }

.rule { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* lab */
.lab-card {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center;
  padding: 44px; border-radius: var(--radius);
  background: var(--bg-raised); border: 1px solid var(--line);
}
.lab-card::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, var(--glow), transparent 70%); pointer-events: none;
}
.status {
  display: inline-flex; align-items: center; gap: 10px; padding: 7px 14px; border-radius: 99px;
  border: 1px solid var(--line-strong); font-size: 13px; margin-bottom: 20px;
}
.status .dot { width: 7px; height: 7px; border-radius: 99px; background: var(--volt); animation: pulse 2.4s ease-in-out infinite; }
:root[data-theme="light"] .status .dot { background: #6a8f00; }
.lab-card h3 { font-size: clamp(24px, 2.6vw, 32px); letter-spacing: -0.02em; font-weight: 600; margin: 0 0 10px; line-height: 1.2; }
.lab-card p { color: var(--muted); margin: 0; max-width: 52ch; }
.lab-visual { z-index: 1; position: relative; width: 150px; height: 150px; border-radius: 36px; background: var(--ink); display: grid; place-items: center; box-shadow: 0 30px 60px -20px rgba(0,0,0,.5); }
.lab-visual svg { width: 58%; fill: var(--volt); }

.stages {
  grid-column: 1 / -1; list-style: none; margin: 4px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; position: relative; z-index: 1;
}
.stage {
  position: relative; padding: 18px 18px 16px; border-radius: 16px;
  border: 1px solid var(--line); background: var(--bg);
}
.stage .bits {
  display: inline-block; font-weight: 600; font-size: 13px; letter-spacing: 0.08em;
  color: var(--muted); padding: 3px 8px; border-radius: 6px; border: 1px solid var(--line-strong);
}
.stage .name { display: block; margin-top: 12px; font-size: 16px; font-weight: 500; }
.stage.done .name { color: var(--muted); }
.stage.now { border-color: var(--volt); }
.stage.now .bits { background: var(--volt); border-color: var(--volt); color: var(--ink); }
:root[data-theme="light"] .stage.now { border-color: var(--ink); }
.now-tag {
  position: absolute; top: 18px; right: 16px; display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--muted);
}
.now-tag .dot { width: 6px; height: 6px; border-radius: 99px; background: var(--volt); animation: pulse 2.4s ease-in-out infinite; }
:root[data-theme="light"] .now-tag .dot { background: #6a8f00; }

/* principles */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.principle {
  padding: 36px 32px; border-radius: var(--radius); border: 1px solid var(--line);
  transition: border-color 0.3s, transform 0.4s var(--ease);
}
.principle:hover { border-color: var(--line-strong); transform: translateY(-4px); }
.principle .num {
  display: inline-block; font-size: 14px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--ink); background: var(--volt); padding: 5px 10px; border-radius: 8px; margin-bottom: 28px;
}
.principle h3 { font-size: 22px; letter-spacing: -0.02em; font-weight: 600; margin: 0 0 10px; }
.principle p { color: var(--muted); margin: 0; font-size: 16px; }

/* story of the mark */
.story { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: center; }
.story-mark { max-width: 360px; width: 100%; margin: 0 auto; }
.story-mark .mark path { transition: fill 0.35s var(--ease), opacity 0.35s var(--ease); }
.story[data-show="zero"] .mark .p-slash,
.story[data-show="one"] .mark path:not(.p-slash),
.story[data-show="z"] .mark .p-tr,
.story[data-show="z"] .mark .p-bl { opacity: 0.14; }
.story p.big { font-size: clamp(20px, 2.2vw, 26px); line-height: 1.5; letter-spacing: -0.01em; margin: 24px 0 32px; font-weight: 300; }
.chips { display: flex; flex-wrap: wrap; gap: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 10px; padding: 12px 18px; border-radius: 14px;
  border: 1.5px solid var(--line-strong); background: none; color: var(--text); cursor: pointer;
  font: 400 15px/1 "Sora", sans-serif; transition: border-color 0.25s, background-color 0.25s, color 0.25s;
}
.chip b { font-weight: 600; font-size: 18px; }
.chip:hover, .chip[aria-pressed="true"] { border-color: var(--volt); }
.chip[aria-pressed="true"] { background: var(--volt); color: var(--ink); }
:root[data-theme="light"] .chip:hover { border-color: var(--ink); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 56px 0 48px; font-size: 14px; color: var(--muted); }
.site-footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; }
.site-footer .brand { margin-bottom: 18px; color: var(--text); }
.site-footer p { margin: 0 0 6px; }
.foot-links { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.foot-links a { text-decoration: none; color: var(--text); }
.foot-links a:hover { color: var(--accent-text); text-decoration: underline; text-underline-offset: 4px; }

/* ---------- legal pages ---------- */
.legal { padding: 64px 0 96px; }
.legal .wrap { max-width: 820px; }
.legal h1 { font-size: clamp(40px, 6vw, 64px); margin-bottom: 16px; }
.legal .meta { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
.legal h2 { font-size: clamp(22px, 2.6vw, 28px); letter-spacing: -0.02em; margin: 56px 0 14px; }
.legal h3 { font-size: 18px; margin: 28px 0 8px; font-weight: 600; }
.legal p, .legal li { color: var(--text); opacity: 0.9; }
.legal ul { padding-left: 1.2em; }
.legal li { margin: 6px 0; }
.legal a { color: var(--accent-text); text-underline-offset: 3px; }
.legal .summary {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-raised);
  padding: 28px 32px; margin: 0 0 8px;
}
.legal .summary h2 { margin-top: 0; font-size: 20px; }
.legal .summary ul { margin: 0; }
.legal .note { border-left: 3px solid var(--volt); padding: 4px 0 4px 18px; color: var(--muted); }
.legal table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 16px 0; }
.legal th, .legal td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.legal th { font-weight: 600; }

.lang-switch { display: inline-flex; border: 1.5px solid var(--line-strong); border-radius: 99px; padding: 4px; margin-bottom: 40px; }
.lang-switch a {
  padding: 8px 16px; border-radius: 99px; text-decoration: none; font-size: 14px; color: var(--muted);
}
.lang-switch a[aria-current="true"] { background: var(--volt); color: var(--ink); }

.notfound { min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 64px 0; }
.notfound .code { font-size: clamp(80px, 16vw, 180px); font-weight: 600; letter-spacing: -0.06em; line-height: 1; margin: 0; }
.notfound .code span { color: var(--accent-text); }

/* ---------- motion ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

@keyframes in-tr { from { opacity: 0; transform: translate(34px, -34px); } to { opacity: 1; transform: none; } }
@keyframes in-bl { from { opacity: 0; transform: translate(-34px, 34px); } to { opacity: 1; transform: none; } }
@keyframes in-slash { from { opacity: 0; transform: scaleY(0); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
@keyframes breathe { 0%, 100% { transform: scale(0.94); opacity: 0.85; } 50% { transform: scale(1.06); opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero { padding: 32px 0 72px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 8px; }
  .mark-stage { order: -1; max-width: 300px; width: 70%; margin: 0 auto; }
  .principles { grid-template-columns: 1fr; }
  .story { grid-template-columns: 1fr; gap: 32px; }
  .story-mark { max-width: 240px; }
  .lab-card { grid-template-columns: 1fr; padding: 32px 28px; }
  .stages { grid-template-columns: repeat(2, 1fr); }
  .lab-visual { width: 110px; height: 110px; border-radius: 28px; order: -1; }
  section { padding: 80px 0; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .nav a.hide-sm { display: none; }
  .nav { gap: 16px; }
  .bit .on, .bit .off { display: none; }
  .site-footer .wrap { grid-template-columns: 1fr; }
  .foot-links { align-items: flex-start; }
  .legal .summary { padding: 22px 20px; }
}
@media (max-width: 380px) {
  .brand-name span { display: none; }
}

.notfound .lead { margin: 16px auto 32px; }
.notfound .actions { justify-content: center; }